using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Text;

namespace Model
{
    /// <summary>
    /// Define a Recipe for the preparation of a meal.
    /// </summary>
    public class Recipe : IEquatable<Recipe>
    {
        #region Attributes
        private string _title = "";
        #endregion

        #region Properties
        /// <summary>
        /// The ID of the recipe - allows you to compare and/or get this item in an easier way.
        /// </summary>
        public int Id { get; init; }

        /// <summary>
        /// The Title of the recipe. <br/>
        /// Set to "No title." when the value passed is null, empty or contain white spaces.
        /// </summary>
        public string Title
        {
            get => _title;
            set
            {
                if (string.IsNullOrWhiteSpace(value))
                    _title = "No title.";
                else
                    _title = value;
            }
        }

        /// <summary>
        /// The steps of the preparation. See: <see cref="PreparationStep"/>.
        /// </summary>
        public List<PreparationStep> PreparationSteps { get; set; }
        #endregion

        #region Constructors
        /// <summary>
        /// Construct a new recipe.
        /// </summary>
        /// <param name="title">The title of the recipe</param>
        /// <param name="id">The id of the recipe. If not given, get a new id.</param>
        /// <param name="preparationSteps">The steps of the preparation of the meal</param>
        public Recipe(string title = "", int? id = null,
                      params PreparationStep[] preparationSteps)
        {
            Title = title;
            PreparationSteps = new List<PreparationStep>(preparationSteps);

            if (id == null) Id = new Random().Next();
            else Id = (int)id;
        }
        #endregion

        #region Methods
        public virtual bool Equals(Recipe? other)
        {
            if (other == null) return false;
            if (other == this) return true;
            return Title.Equals(other.Title) && PreparationSteps.Equals(other.PreparationSteps);
        }

        public override int GetHashCode()
        {
            return Id.GetHashCode();
        }

        public override string ToString()
        {
            StringBuilder sb = new StringBuilder($"[Recipe n°{Id}] - {Title}\n");
            foreach (PreparationStep ps in PreparationSteps)
            {
                sb.AppendFormat("\t* {0}\n", ps.ToString());
            }
            return sb.ToString();
        }
        #endregion
    }
}